(Sm_(1-x)La_x)_2Ce_2O_7(0

Thermophysical properties of (Sm_(1-x)La_x)_2Ce_2O_7(0 我的收藏 名 称： 注 释：

作　　者：赵让乾 李国防[2] 汤安 张红松 陈晓鸽 ZHAO Rangqian1 , LI Guofang2 , TANG An1 , ZHANG Hongsong1 , CHEN Xiaoge3(1.College of Mechanical Engineering, Henan University of Engineering, Zhengzhou 451191, China; 2. Institute of Chemistry Henan Academy of Sciences, Zhengzhou 450002, China; 3. School of Civil Engineering, Henan University of Engineering, Zhengzhou 451191,Chin)

机构地区：[1]河南工程学院机械工程学院,郑州451191 [2]河南省科学院化学研究所有限公司,郑州450002 [3]河南工程学院土木工程学院,郑州451191

出　　处：《功能材料》2018年第5期5081-5085,5090,共6页Journal of Functional Materials

基　　金：基金项目：河南眚高校科技创新团队支持计划资助项目(181RTSTHN005)

摘　　要：以La_2O_3、Sm_2O_3和CeO_2为原料,采用高温固相反应法制备了(Sm_(1-x)La_x)_2Ce_2O_7(0<x<1)系列固溶体。并对其相结构、显微组织、元素组成、热物理性能进行了研究。X射线衍射分析表明,所合成的(Sm_(1-x)La_x)_2Ce_2O_7(0<x<1)系列固溶体具有典型的单一缺陷萤石型结构。扫描电镜分析表明,其显微组织十分致密,相对致密度>92%,且各元素摩尔比与其化学式比较接近。其热导率随着La_2O_3掺杂量的增加而降低,并明显低于Y_2O_3部分稳定ZrO_2的热导率。其在1 000℃时的热膨胀系数处于11.83×10^(-6)/K至12.86×10^(-6)/K之间,明显高于YSZ的9×10^(-6)/K。该系列固溶体良好的热物理性能,表明其有潜力用作新型热障涂层表面陶瓷层材料。The（Sm（1-x）Lax）2Ce2O7（0x1）solid solutions were prepared by solid state reaction method using La2O3,Sm2O3and CeO2as reactants.Their phase structure,microstructure,element composition and thermophyscial properties were investigated.X-ray diffraction results show that pure（Sm（1-x）Lax）2Ce2O7（0x1）solid solutions with single fluorite-type crystal lattice were synthesized successfully.SEM results indicate that the microstructure is very dense and the interfaces between grains are very clean.The relative density is greater than 92%and element atomic ratio is close their chemical-type.The thermal conductivity decreases with the increasing La2O3-content,which is also lower than that of YSZ.The thermal expansion coefficient at 1 000℃is in the range of 11.83×10^（-6 ）to 12.86×10^（-6）/K,which is greater than that of YSZ.The excellent thermophyscial properties means that the synthesized ceramics can be explored candidate for thermal barrier coatings.

关 键 词：稀土氧化物 热物理性能 置换原子 掺杂 

分 类 号：TB34[一般工业技术—材料科学与工程]